Hair fastener



FIG. 1 is a top plan view of a hair fastener showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is an opposing side view thereof;

FIG. 5 is an end view thereof; and,

FIG. 6 is an opposite end view thereof.

The combs are shown in broken lines for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a hair fastener, as shown and described. 